Stan Wawrinka is in track to winning his first title since undergoing two knee surgeries in 2017, seeing off Canadian 10th seed Denis Shapovalov 6-4 7-6 (7-4) on Friday to set up an intriguing semi-final with top seed Kei Nishikori at the ATP tour event in Rotterdam.
The Swiss wildcard broke for a 5-4 lead in the opening set and sealed the win in a well-mastered tiebreak.
"Physically I feel really good, and I'm moving and feeling better match after match," said Wawrinka.
"Tonight was a tough match. I had to really fight at the end. I was a bit nervous at the end of the match. We had some long rallies. It's good to see that I can keep being there, mentally, physically."
Japanese Nishikori took a step closer to claiming his second title of the year, winning 72 per cent of his first serves to defeat Hungary's Marton Fucsovics 6-3 6-2.
Fifth seed Daniil Medvedev was also a straight sets winner, dismantling Frenchman Jo-Wilfried Tsonga 6-4 6-2.
The Russian will face another Frenchman in Gael Monfils in the other semi, after he beat Bosnia's Damir Dzumhur 6-1 6-2.
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